CN211278022U - A dust removal device for a polishing machine - Google Patents

Abstract

The utility model relates to the technical field of attachment devices of dust removal equipment, in particular to a dust removal device for a polishing machine, which can extract the air near the polishing wheel of the polishing machine without affecting the normal operation of the polishing machine, thereby reducing the dust diffusion The probability of reaching the surrounding environment is to improve the dust removal adequacy of the dust removal device, thus improving the dust removal effect of the dust removal hood device; including the workbench, the exhaust fan assembly, the exhaust hood and the support rod. The bottom area of the left end of the cavity is provided with an installation hole, and the exhaust fan assembly is installed in the installation hole. The air groove also includes a tightening knob, a positive threaded rod, a reverse threaded rod, two sets of driving plates, two sets of splints, an adjustment plate, a mounting bracket and an air extraction pipe. The front and rear ends of the adjustment plate are respectively provided with two sets of rotating grooves.

Description

A dust removal device for a polishing machine

technical field

The utility model relates to the technical field of attachment devices of dust removal equipment, in particular to a dust removal device for polishing machines.

Background technique

As we all know, polishing machines are often used in the process of workpiece production, and more dust will be generated when polishing workpieces by polishing machines. In order to reduce the pollution of dust to the surrounding environment and reduce the impact on the health of workers , it is necessary to carry out dust reduction treatment for the dust generated during the polishing process of the workpiece. The dust removal device for the polishing machine is a device used to collect the dust generated by the polishing work during the polishing process of the workpiece by the polishing machine. It has been widely used in the field of machine application; the existing dust removal device for polishing machines includes a workbench, an exhaust fan assembly, a suction hood and a support rod. There are installation holes, the exhaust fan assembly is installed in the installation hole, the input end of the exhaust fan assembly is located in the collection cavity, the input end of the exhaust fan assembly is provided with a filter mechanism, and the bottom end of the support rod is connected to the left side of the top middle of the workbench. The left end of the air extraction hood is connected with the top area of the right end of the support rod, the bottom end of the air extraction hood is provided with an air extraction groove, the top of the air extraction groove is communicated with the top area of the left end of the collection cavity, and an air suction pipe is arranged, and the bottom area of the right end of the collection cavity is communicated with A cleaning hole is provided, and a switch assembly is sealed on the cleaning hole; when the existing dust removal device for a polishing machine is used, the polished workpiece is first placed on the top of the workbench, and then the exhaust fan assembly is activated to extract the collection chamber. In the negative pressure state, at this time, the air hood will draw the air from its lower side into the collection chamber. When the worker polishes the workpiece through the polishing machine, the generated dust is drawn into the collection chamber through the outside air, and then The filter mechanism can filter the dust in the collection chamber. After the work is completed, the staff can open the switch assembly and clean the collection chamber and the filter mechanism through the cleaning hole. In the use of the existing dust removal device for polishing machines, it is found that, The distance between the extraction hood and the worktable is large, and the probability of some dust still spreading to the surrounding environment is high, thus reducing the dust removal adequacy of the dust removal device, that is, the dust removal effect of the dust removal device is reduced, resulting in poor practicability.

Utility model content

In order to solve the above-mentioned technical problems, the utility model provides a method that can extract the air near the polishing wheel of the polishing machine without affecting the normal operation of the polishing machine, thereby reducing the probability of dust spreading to the surrounding environment, that is, improving the efficiency of the dust removal device. A sufficient degree of dust removal, thus improving the dust removal effect of the dust removal hood device, thereby enhancing the practicality of the dust removal device for polishing machines.

The utility model relates to a dust removal device for a polishing machine, which comprises a workbench, an exhaust fan assembly, an air extraction hood and a support rod. A collection cavity is arranged inside the workbench, and an installation hole is provided through the bottom area of the left end of the collection cavity. Installed in the installation hole, the input end of the exhaust fan assembly is located in the collection cavity, the input end of the exhaust fan assembly is provided with a filter mechanism, the bottom end of the support rod is connected to the left side of the top middle of the workbench, and the left end of the exhaust hood is connected to the support rod. The top area of the right end of the collection chamber is connected to the top area, the bottom end of the air extraction hood is provided with an air extraction groove, the top of the air extraction groove is connected with the top area of the left end of the collection cavity and is provided with a suction pipe, and the bottom area of the right end of the collection cavity is connected with a cleaning hole. The upper seal is provided with a switch assembly; it also includes a tightening knob, a positive threaded rod, a reverse threaded rod, two sets of driving plates, two sets of splints, an adjustment plate, a mounting bracket and an air extraction pipe, the front and rear ends of the adjustment plates are respectively set There are two sets of rotating grooves, the middle and upper regions of the two sets of splints are respectively hinged with the two sets of rotating grooves, the tops of the two sets of splints are respectively provided with two sets of fixing grooves, and the bottom ends of the two sets of driving plates are respectively connected with the two sets of rotating grooves. The group fixing grooves are hingedly connected, and the front end of the front side driving plate and the rear end of the rear side driving plate are respectively provided with reverse threaded holes and positive threaded holes, which are respectively screwed with the positive threaded rod and the reverse threaded rod. , the front end of the positive threaded rod is connected with the rear end of the reverse threaded rod, the two sets of driving plates are symmetrical about the connection part of the positive threaded rod and the reverse threaded rod, and the rear end of the positive threaded rod is connected with the front end of the tightening knob Connection, the right end of the top area of the mounting frame is connected to the middle of the left end of the adjusting plate, the top right side of the air suction pipe is provided with a U-shaped groove, the left end of the mounting frame is connected to the left end of the U-shaped groove, the suction pipe is The inside of the air pipe is provided with a flow cavity, the bottom end of the flow cavity is evenly provided with a plurality of groups of air inlet holes, the top area of the left end of the collection cavity is connected with the top of the left area of the flow cavity, and a corrugated hose is arranged. A penetration hole is provided through the middle and upper region of the right end of the rod, and the penetration hole is sleeved with the corrugated hose.

The utility model relates to a dust removal device for a polishing machine, further comprising a dust collecting frame and three sets of positioning rods. A clamping slot is provided through the top left of the dust collecting frame, and the inner side wall of the clamping slot is connected to the top of the worktable. The front end, the right end and the right end of the area are slidably close to each other, the inner ends of the three sets of positioning rods are respectively connected with the right end, the front end and the rear end of the top area of the workbench, and three sets of positioning grooves are respectively provided on the inner sides of the top ends of the three sets of positioning rods. The middle part of the right end, the middle part of the front end and the middle part of the rear end of the bottom area of the dust collecting frame are respectively clamped with three groups of positioning grooves. The bottom ends are connected with the top left side of the workbench.

The utility model relates to a dust removal device for a polishing machine, further comprising four groups of lifting threaded rods and four groups of legs, wherein the top ends of the four groups of lifting threaded rods are respectively connected to the left front side, left rear side and right front side of the bottom end of the worktable. Connected with the right rear side, the top ends of the four groups of legs are respectively provided with four groups of lifting thread grooves, and the four groups of lifting thread grooves are respectively screwed with the four groups of lifting thread rods.

The dust removal device for a polishing machine of the utility model further comprises two sets of lifting handles, wherein the inner ends of the two sets of lifting handles are respectively connected with the front and rear ends of the dust collecting frame.

The utility model relates to a dust removal device for a polishing machine, further comprising two sets of anti-skid rubber pads, wherein the outer ends of the two sets of anti-skid rubber pads are respectively connected with the inner ends of the bottom regions of the two sets of splints.

The utility model relates to a dust removal device for a polishing machine, further comprising two sets of rotating handles, wherein the inner ends of the two sets of rotating handles are respectively connected with the left and right ends of the tightening knob.

The utility model relates to a dust removal device for a polishing machine, wherein a sealing strip is arranged on the inner side wall of the clamping groove of the dust collection frame.

The utility model relates to a dust removal device for a polishing machine, further comprising four sets of anti-skid handle sleeves, and the four sets of anti-slip handle sleeves are respectively fitted with four sets of outrigger legs.

Compared with the prior art, the beneficial effect of the present utility model is: before the staff work with the polishing machine by hand, the staff can first clip the left area of the polishing machine into the inner side of the two sets of splints, and then turn the tightening knob to make the polishing machine straight. The threaded rod and the anti-threaded rod rotate synchronously and in the same direction. At this time, the two sets of driving plates move away at the same speed at the same speed, and then the two sets of driving plates respectively drive the top areas of the two sets of splints under the support of the hinged parts at both ends of the adjustment plate. Rotate to the outside, and at the same time, the bottom area of the two sets of splints moves inward until the two sets of splints clamp the left area of the polishing machine. At this time, the air suction pipe on the mounting frame of the adjustment plate is located at the edge area of the polishing wheel of the polishing machine. On the upper side, the dust removal device can be activated at this time, and then the staff can hold the polishing machine to drive the polishing wheel to polish the workpiece. At this time, the exhaust pipe will suck the dust generated by the polishing workpiece of the polishing machine into the collection cavity of the workbench. Yes, at the same time, the exhaust hood and the exhaust pipe perform the exhaust and dust removal work at the same time, so that the air near the polishing wheel of the polishing machine can be extracted without affecting the normal operation of the polishing machine, thus reducing the probability of dust spreading to the surrounding environment, that is, improving The dust removal adequacy of the dust removal device is improved, thereby improving the dust removal effect of the dust removal hood device, thereby enhancing the practicability.

Description of drawings

Fig. 1 is the structural representation of the present utility model;

Fig. 2 is the partial enlarged structural representation of A of the present utility model;

3 is a schematic diagram of the connection structure of the positive threaded rod and the tightening knob of the present invention;

4 is a schematic diagram of the connection structure of the air extraction pipe and the mounting frame of the present invention;

5 is a schematic diagram of the connection structure of two sets of lifting handles and a dust collecting frame of the present invention;

Symbols in the drawings: 1. Workbench; 2. Exhaust fan assembly; 3. Exhaust hood; 4. Support rod; 5. Collection cavity; 6. Filter mechanism; 7. Suction pipe; 8. Cleaning hole; 9. Switch Components; 10. Fastening knob; 11. Positive threaded rod; 12. Reverse threaded rod; 13. Two sets of driving plates; 14. Two sets of splints; 15. Adjustment plate; 16. Mounting frame; 17. Air extraction pipe; 18. U-shaped groove; 19, flow chamber; 20, corrugated hose; 21, dust collection frame; 22, three sets of positioning rods; 23, three sets of positioning grooves; 24, four sets of lifting threaded rods; 25, four sets of outriggers; 26. Two sets of lifting handles; 27. Two sets of anti-slip rubber pads; 28. Two sets of rotating handles; 29. Sealing strips; 30. Four sets of anti-slip grips; 31. Two sets of baffles.

Detailed ways

The specific embodiments of the present utility model will be described in further detail below with reference to the accompanying drawings and embodiments. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

As shown in Figures 1 to 5, a dust removal device for a polishing machine of the present invention includes a workbench 1, an exhaust fan assembly 2, a draft hood 3 and a support rod 4. The workbench 1 is provided with a collection cavity 5 inside. The bottom area of the left end of the collection cavity 5 is provided with an installation hole, and the exhaust fan assembly 2 is installed in the installation hole. The input end of the exhaust fan assembly 2 is located in the collection cavity 5, and the input end of the exhaust fan assembly 2 is provided with a filter mechanism 6. The bottom end of the rod 4 is connected to the left side of the top middle of the workbench 1, the left end of the suction hood 3 is connected to the top area of the right end of the support rod 4, and the bottom end of the suction hood 3 is provided with a suction groove, and the top of the suction groove is connected to the collection The top area of the left end of the cavity 5 is communicated with a suction pipe 7, and the bottom area of the right end of the collection cavity 5 is communicated with a cleaning hole 8, and a switch assembly 9 is sealed on the cleaning hole 8; it also includes a tightening knob 10 and a positive threaded rod 11. , anti-threaded rod 12, two groups of driving plates 13, two groups of plywood 14, adjustment plate 15, mounting frame 16 and air extraction pipe 17, the front and rear ends of the adjustment plate 15 are respectively provided with two groups of rotating grooves, the two groups of plywood 14 The middle and upper regions are respectively hinged with two sets of rotating grooves, the tops of the two sets of splints 14 are respectively provided with two sets of fixed grooves, the bottom ends of the two sets of driving plates 13 are respectively hinged with the two sets of fixed grooves, and the front and rear sides of the front side driving plates are respectively provided with two sets of fixed grooves. The rear end of the driving plate is respectively provided with a reverse threaded hole and a positive threaded hole. The positive threaded hole and the reverse threaded hole are respectively screwed with the positive threaded rod 11 and the reverse threaded rod 12. The front end of the positive threaded rod 11 and the back of the reverse threaded rod 12 The two sets of driving plates 13 are symmetrical about the connection parts of the positive threaded rod 11 and the reverse threaded rod 12, the rear end of the positive threaded rod 11 is connected with the front end of the tightening knob 10, and the right end of the top area of the mounting bracket 16 is connected with the adjustment plate 15. A U-shaped groove 18 is provided through the top right side of the air extraction pipe 17, the left end of the mounting bracket 16 is connected with the left end of the U-shaped groove 18, and a flow cavity 19 is provided inside the air extraction pipe 17. The bottom of the flow cavity 19 The ends are evenly provided with a plurality of groups of air intake holes, the top area of the left end of the collecting chamber 5 is connected with the top end of the left area of the flow chamber 19 and a corrugated hose 20 is arranged, and the middle and upper area of the right end of the support rod 4 is provided with a penetration hole through it. Through hole and corrugated hose 20 sets; before the staff work with the polishing machine, the staff can first click the left area of the polishing machine into the inner side of the two sets of splints, and then turn the tightening knob to make the positive thread rod and reverse thread The rods rotate synchronously and in the same direction. At this time, the two sets of driving plates move away at the same speed at the same speed, and then the two sets of driving plates respectively drive the top areas of the two sets of splints to rotate to the outside under the support of the hinged parts at both ends of the adjusting plate, and at the same time The bottom area of the two sets of splints moves inward until the two sets of splints clamp the left area of the polishing machine. At this time, the air suction pipe on the mounting frame of the adjusting plate is located on the upper side of the edge area of the polishing wheel of the polishing machine. At this time Then the dust removal device can be started, and then the staff can hold the polishing machine to drive the polishing wheel to polish the workpiece. At this time, the exhaust pipe can suck the dust generated by the polishing workpiece of the polishing machine into the collection cavity of the workbench, and the exhaust hood can The exhaust and dust removal work is carried out at the same time as the exhaust pipe, so as to The air near the polishing wheel of the polishing machine can be extracted without affecting the normal operation of the polishing machine, thus reducing the probability of dust spreading to the surrounding environment, that is, improving the dedusting adequacy of the dedusting device, thus improving the dedusting of the dedusting hood device. effect, thereby enhancing usability.

The dust-removing device for a polishing machine of the present invention further comprises a dust-collecting frame 21 and three sets of positioning rods 22 . A card slot is provided through the top left of the dust-collecting frame 21 , and the inner side wall of the card slot is connected to the top of the workbench 1 . The front end, the right end and the right end of the area are sliding and close to each other, the inner ends of the three groups of positioning rods 22 are respectively connected with the right end, the front end and the rear end of the top area of the workbench 1, and three groups of positioning grooves 23 are respectively provided on the inside of the top ends of the three groups of positioning rods 22. The middle part of the right end, the middle part of the front end and the middle part of the rear end of the bottom area of the dust collecting frame 21 are respectively clamped with three sets of positioning grooves 23 . The bottom end is connected with the top left side of the workbench 1; during the polishing process, more debris will fall on the workbench, and at this time, two sets of baffles can prevent the debris from falling to the left side of the workbench. Then, when the staff cleans the workbench, they can sweep the debris on the top of the workbench out of the workbench at the right end, front end and rear end of the workbench, and then the cleaned debris will fall to the dust collecting frame At this time, the dust collecting frame can be lifted on the three sets of positioning rods to pour out the waste inside it, which makes the cleaning of the debris more convenient, thereby enhancing the convenience.

A dust removal device for a polishing machine of the present invention further comprises four groups of lifting threaded rods 24 and four groups of legs 25. The tops of the four groups of lifting threaded rods 24 are respectively connected to the left front side, left rear side, The right front side and the right rear side are connected, the tops of the four groups of legs 25 are respectively provided with four groups of lifting thread grooves, and the four groups of lifting thread grooves are respectively screwed with the four groups of lifting thread rods 24; by rotating the four groups of legs, the four groups of The lifting thread grooves are respectively rotated on the four groups of lifting thread rods. At this time, the protruding length of the four groups of outriggers at the bottom of the worktable is changed, and the placement stability of the dust removal device is improved.

A dust removal device for a polishing machine of the present invention further comprises two sets of lifting handles 26, and the inner ends of the two sets of lifting handles 26 are respectively connected with the front and rear ends of the dust collecting frame 21; The disassembly and assembly control of the dust collecting frame is more convenient, thereby enhancing the practicability.

The dust removal device for a polishing machine of the present invention further comprises two sets of anti-skid rubber pads 27, the outer ends of the two sets of anti-skid rubber pads 27 are respectively connected with the inner ends of the bottom regions of the two sets of splints 14; The friction coefficient of the inner ends of the two sets of splints is increased, the probability of the two sets of splints slipping off on the polishing machine is reduced, and the practicality is enhanced.

The dust removal device for a polishing machine of the present invention further comprises two sets of rotating handles 28, and the inner ends of the two sets of rotating handles 28 are respectively connected with the left and right ends of the tightening knob 10; The rotation is more labor-saving and convenient, thereby enhancing the practicability.

In the dust removal device for a polishing machine of the present invention, the inner side wall of the clamping groove of the dust collecting frame 21 is provided with a sealing rubber strip 29; The probability of debris falling through the gap between the dust collection frame and the workbench enhances usability.

The utility model is a dust removal device for a polishing machine, further comprising four groups of anti-slip handle covers 30, the four groups of anti-slip handle covers 30 are respectively fixed and fitted with the four groups of legs 25; the four groups of anti-slip handle covers are respectively enlarged by four groups. The coefficient of friction of the outer side walls of the legs, thus reducing the probability of the hand slipping on the four sets of legs when turning the four sets of legs, enhances practicality.

The utility model relates to a dust-removing device for a polishing machine. When working, before the staff holds the polishing machine to work, the staff can first clip the left area of the polishing machine into the inner side of the two sets of splints, and then rotate and fasten it. The knob makes the forward threaded rod and the reverse threaded rod rotate synchronously and in the same direction. At this time, the two sets of driving plates move away at the same speed at the same speed, and then the two sets of driving plates respectively drive the top areas of the two sets of splints at the hinged parts between the two sets of splints and the two ends of the adjustment plate. Under the support of the polishing machine, it rotates to the outside, and at the same time, the bottom area of the two sets of splints moves to the inside until the two sets of splints clamp the left area of the polishing machine. At this time, the air extraction pipe on the mounting frame of the adjusting plate is located on the polishing wheel of the polishing machine. At this time, the exhaust fan assembly will be activated to draw the collection chamber into a negative pressure state. At this time, the suction hood will draw the air from its lower side into the collection chamber, and then the staff can hold the polishing machine. Drive the polishing wheel to polish the workpiece. At this time, the exhaust pipe can suck the dust generated by the polishing workpiece of the polishing machine into the collection cavity of the workbench. At the same time, the exhaust hood and the exhaust pipe are simultaneously exhausted and dedusted. When the polishing machine polishes the workpiece, the generated dust is drawn into the collection chamber through the outside air, and then the filter mechanism filters the dust in the collection chamber. The holes can be used to clean the collection cavity and the filter mechanism.

The terms "front," "rear," "left," "right," and similar expressions are used herein for illustrative purposes only.

The above are only the preferred embodiments of the present utility model. It should be pointed out that for those skilled in the art, without departing from the technical principles of the present utility model, several improvements and modifications can be made. These improvements and modifications should also be regarded as the protection scope of the present invention.

Claims (8)

1. A dust removal device for a polishing machine, comprising a workbench (1), an exhaust fan assembly (2), a suction hood (3) and a support rod (4), and a collection cavity (5) is provided inside the workbench (1). , the bottom area of the left end of the collection cavity (5) is provided with a mounting hole, the exhaust fan assembly (2) is installed in the installation hole, the input end of the exhaust fan assembly (2) is located in the collection cavity (5), and the exhaust fan assembly (2) ) is provided with a filter mechanism (6) at the input end, the bottom end of the support rod (4) is connected to the left side of the top middle of the workbench (1), and the left end of the hood (3) is connected to the top area of the right end of the support rod (4). connected, the bottom end of the air extraction hood (3) is provided with an air extraction groove, the top of the air extraction groove communicates with the top area of the left end of the collection cavity (5) and is provided with an air suction pipe (7), and the bottom area of the right end of the collection cavity (5) is provided with an air suction pipe (7). A cleaning hole (8) is communicated with the cleaning hole (8), and a switch assembly (9) is sealed on the cleaning hole (8); it is characterized in that it also includes a tightening knob (10), a positive threaded rod (11), and a reverse threaded rod (12) , two sets of driving plates (13), two sets of splints (14), adjustment plates (15), mounting brackets (16) and air extraction pipes (17), the front and rear ends of the adjustment plates (15) are respectively provided with two A set of rotating grooves, the middle and upper regions of the two sets of splints (14) are hinged with the two sets of rotating grooves, the tops of the two sets of splints (14) are respectively provided with two sets of fixing grooves, and the two sets of driving plates (13) The bottom ends of the The rod (11) and the reverse threaded rod (12) are screwed together, the front end of the forward threaded rod (11) is connected with the rear end of the reverse threaded rod (12), and the two sets of driving plates (13) are about the forward threaded rod (13). 11) The connection parts of the reverse threaded rod (12) are symmetrical, the rear end of the positive threaded rod (11) is connected to the front end of the tightening knob (10), and the right end of the top area of the mounting bracket (16) is connected to the adjustment plate The middle of the left end of (15) is connected, the top right side of the exhaust pipe (17) is provided with a U-shaped groove (18) through it, and the left end of the mounting bracket (16) is connected with the left end of the U-shaped groove (18), so A flow cavity (19) is provided inside the air extraction pipe (17), the bottom end of the flow cavity (19) is evenly provided with a plurality of groups of air intake holes, and the top area of the left end of the collection cavity (5) is connected to the flow cavity (19). A corrugated hose (20) is communicated with the top of the left region of 19), and a penetration hole is provided through the middle and upper region of the right end of the support rod (4), and the penetration hole is sleeved with the corrugated hose (20). 2. A dust removal device for a polishing machine according to claim 1, characterized in that it further comprises a dust collecting frame (21) and three sets of positioning rods (22), and the top left side of the dust collecting frame (21) A card slot is provided through the card slot, the inner side wall of the card slot and the front end, the right end and the right end of the top area of the workbench (1) slide in close contact, and the inner ends of the three sets of positioning rods (22) are respectively connected to the workbench (1) The right end, the front end and the rear end of the top area of the dust collecting frame (21) are connected to each other, the top inner sides of the three sets of positioning rods (22) are respectively provided with three sets of positioning grooves (23). The middle part of the rear end is respectively clamped with three sets of positioning grooves (23), and two sets of baffle plates (31) are respectively provided at the front end and the rear end of the bottom region of the support rod (4), and the bottom ends of the two sets of baffle plates (31) Both are connected to the top left side of the workbench (1). 3. A dust removal device for a polishing machine according to claim 2, characterized in that further comprising four groups of lifting threaded rods (24) and four groups of legs (25), said four groups of lifting threaded rods (24) The top ends of the legs (25) are respectively connected with the front left side, the rear left side, the front right side and the rear right side of the bottom end of the workbench (1). The groups of lifting thread grooves are respectively screwed with the four groups of lifting thread rods (24). 4 . The dust removal device for a polishing machine according to claim 3 , further comprising two sets of lifting handles ( 26 ), wherein the inner ends of the two sets of lifting handles ( 26 ) are respectively connected to the dust collecting frame. 5 . (21) The front end and the back end are connected. 5 . The dust removal device for a polishing machine according to claim 4 , further comprising two sets of anti-skid rubber pads ( 27 ), wherein the outer ends of the two sets of anti-skid rubber pads ( 27 ) are respectively connected with two sets of splints. 6 . (14) is connected inside the bottom area. 6 . The dust removal device for a polishing machine according to claim 5 , further comprising two sets of rotating handles ( 28 ), wherein the inner ends of the two sets of rotating handles ( 28 ) are respectively connected with the fastening knobs ( 10 ). 7 . ) are connected to the left and right ends. 7 . The dust removal device for a polishing machine according to claim 6 , wherein a sealing strip ( 29 ) is provided on the inner side wall of the clamping groove of the dust collecting frame ( 21 ). 8 . 8 . The dust removal device for a polishing machine according to claim 7 , further comprising four groups of anti-slip handle covers ( 30 ), the four groups of anti-slip handle covers ( 30 ) being respectively connected with four groups of outriggers ( 25 ). 9 . ) fixed set.

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